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Expired European patentEurope

Removal of dyestuffs from water by electroflotation process

EP 0091504 B1 · Applicant: MORTON THIOKOL, INC.

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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed April 14, 1982 and granted January 29, 1986. A European patent lasts at most 20 years from filing, so its term ended April 14, 2002.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by October 14, 2007.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledApril 14, 1982
PublishedOctober 19, 1983
GrantedJanuary 29, 1986
Term endedApril 14, 2002
Application numberEP 82103142
Classification (CPC)C02F1/465

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedApril 14, 1982PublishedOct 19, 1983Patent grantedJan 29, 1986Term endedApril 14, 2002

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

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